FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/truespeech.c
Date: 2022-07-04 19:11:22
Exec Total Coverage
Lines: 181 186 97.3%
Branches: 69 72 95.8%

Line Branch Exec Source
1 /*
2 * DSP Group TrueSpeech compatible decoder
3 * Copyright (c) 2005 Konstantin Shishkov
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavutil/channel_layout.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/mem_internal.h"
25
26 #include "avcodec.h"
27 #include "bswapdsp.h"
28 #include "codec_internal.h"
29 #include "get_bits.h"
30 #include "internal.h"
31
32 #include "truespeech_data.h"
33 /**
34 * @file
35 * TrueSpeech decoder.
36 */
37
38 /**
39 * TrueSpeech decoder context
40 */
41 typedef struct TSContext {
42 BswapDSPContext bdsp;
43 /* input data */
44 DECLARE_ALIGNED(16, uint8_t, buffer)[32];
45 int16_t vector[8]; ///< input vector: 5/5/4/4/4/3/3/3
46 int offset1[2]; ///< 8-bit value, used in one copying offset
47 int offset2[4]; ///< 7-bit value, encodes offsets for copying and for two-point filter
48 int pulseoff[4]; ///< 4-bit offset of pulse values block
49 int pulsepos[4]; ///< 27-bit variable, encodes 7 pulse positions
50 int pulseval[4]; ///< 7x2-bit pulse values
51 int flag; ///< 1-bit flag, shows how to choose filters
52 /* temporary data */
53 int filtbuf[146]; // some big vector used for storing filters
54 int prevfilt[8]; // filter from previous frame
55 int16_t tmp1[8]; // coefficients for adding to out
56 int16_t tmp2[8]; // coefficients for adding to out
57 int16_t tmp3[8]; // coefficients for adding to out
58 int16_t cvector[8]; // correlated input vector
59 int filtval; // gain value for one function
60 int16_t newvec[60]; // tmp vector
61 int16_t filters[32]; // filters for every subframe
62 } TSContext;
63
64 2 static av_cold int truespeech_decode_init(AVCodecContext * avctx)
65 {
66 2 TSContext *c = avctx->priv_data;
67
68
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2 if (avctx->ch_layout.nb_channels != 1) {
69 avpriv_request_sample(avctx, "Channel count %d", avctx->ch_layout.nb_channels);
70 return AVERROR_PATCHWELCOME;
71 }
72
73 2 av_channel_layout_uninit(&avctx->ch_layout);
74 2 avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
75 2 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
76
77 2 ff_bswapdsp_init(&c->bdsp);
78
79 2 return 0;
80 }
81
82 1442 static void truespeech_read_frame(TSContext *dec, const uint8_t *input)
83 {
84 GetBitContext gb;
85
86 1442 dec->bdsp.bswap_buf((uint32_t *) dec->buffer, (const uint32_t *) input, 8);
87 1442 init_get_bits(&gb, dec->buffer, 32 * 8);
88
89 1442 dec->vector[7] = ts_codebook[7][get_bits(&gb, 3)];
90 1442 dec->vector[6] = ts_codebook[6][get_bits(&gb, 3)];
91 1442 dec->vector[5] = ts_codebook[5][get_bits(&gb, 3)];
92 1442 dec->vector[4] = ts_codebook[4][get_bits(&gb, 4)];
93 1442 dec->vector[3] = ts_codebook[3][get_bits(&gb, 4)];
94 1442 dec->vector[2] = ts_codebook[2][get_bits(&gb, 4)];
95 1442 dec->vector[1] = ts_codebook[1][get_bits(&gb, 5)];
96 1442 dec->vector[0] = ts_codebook[0][get_bits(&gb, 5)];
97 1442 dec->flag = get_bits1(&gb);
98
99 1442 dec->offset1[0] = get_bits(&gb, 4) << 4;
100 1442 dec->offset2[3] = get_bits(&gb, 7);
101 1442 dec->offset2[2] = get_bits(&gb, 7);
102 1442 dec->offset2[1] = get_bits(&gb, 7);
103 1442 dec->offset2[0] = get_bits(&gb, 7);
104
105 1442 dec->offset1[1] = get_bits(&gb, 4);
106 1442 dec->pulseval[1] = get_bits(&gb, 14);
107 1442 dec->pulseval[0] = get_bits(&gb, 14);
108
109 1442 dec->offset1[1] |= get_bits(&gb, 4) << 4;
110 1442 dec->pulseval[3] = get_bits(&gb, 14);
111 1442 dec->pulseval[2] = get_bits(&gb, 14);
112
113 1442 dec->offset1[0] |= get_bits1(&gb);
114 1442 dec->pulsepos[0] = get_bits_long(&gb, 27);
115 1442 dec->pulseoff[0] = get_bits(&gb, 4);
116
117 1442 dec->offset1[0] |= get_bits1(&gb) << 1;
118 1442 dec->pulsepos[1] = get_bits_long(&gb, 27);
119 1442 dec->pulseoff[1] = get_bits(&gb, 4);
120
121 1442 dec->offset1[0] |= get_bits1(&gb) << 2;
122 1442 dec->pulsepos[2] = get_bits_long(&gb, 27);
123 1442 dec->pulseoff[2] = get_bits(&gb, 4);
124
125 1442 dec->offset1[0] |= get_bits1(&gb) << 3;
126 1442 dec->pulsepos[3] = get_bits_long(&gb, 27);
127 1442 dec->pulseoff[3] = get_bits(&gb, 4);
128 1442 }
129
130 1442 static void truespeech_correlate_filter(TSContext *dec)
131 {
132 int16_t tmp[8];
133 int i, j;
134
135
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12978 for(i = 0; i < 8; i++){
136
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11536 if(i > 0){
137 10094 memcpy(tmp, dec->cvector, i * sizeof(*tmp));
138
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50470 for(j = 0; j < i; j++)
139 40376 dec->cvector[j] += (tmp[i - j - 1] * dec->vector[i] + 0x4000) >> 15;
140 }
141 11536 dec->cvector[i] = (8 - dec->vector[i]) >> 3;
142 }
143
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12978 for(i = 0; i < 8; i++)
144 11536 dec->cvector[i] = (dec->cvector[i] * ts_decay_994_1000[i]) >> 15;
145
146 1442 dec->filtval = dec->vector[0];
147 1442 }
148
149 1442 static void truespeech_filters_merge(TSContext *dec)
150 {
151 int i;
152
153
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1442 if(!dec->flag){
154
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99 for(i = 0; i < 8; i++){
155 88 dec->filters[i + 0] = dec->prevfilt[i];
156 88 dec->filters[i + 8] = dec->prevfilt[i];
157 }
158 }else{
159
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12879 for(i = 0; i < 8; i++){
160 11448 dec->filters[i + 0]=(dec->cvector[i] * 21846 + dec->prevfilt[i] * 10923 + 16384) >> 15;
161 11448 dec->filters[i + 8]=(dec->cvector[i] * 10923 + dec->prevfilt[i] * 21846 + 16384) >> 15;
162 }
163 }
164
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12978 for(i = 0; i < 8; i++){
165 11536 dec->filters[i + 16] = dec->cvector[i];
166 11536 dec->filters[i + 24] = dec->cvector[i];
167 }
168 1442 }
169
170 5768 static void truespeech_apply_twopoint_filter(TSContext *dec, int quart)
171 {
172 int16_t tmp[146 + 60], *ptr0, *ptr1;
173 const int16_t *filter;
174 int i, t, off;
175
176 5768 t = dec->offset2[quart];
177
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5768 if(t == 127){
178 358 memset(dec->newvec, 0, 60 * sizeof(*dec->newvec));
179 358 return;
180 }
181
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795270 for(i = 0; i < 146; i++)
182 789860 tmp[i] = dec->filtbuf[i];
183 5410 off = (t / 25) + dec->offset1[quart >> 1] + 18;
184 5410 off = av_clip(off, 0, 145);
185 5410 ptr0 = tmp + 145 - off;
186 5410 ptr1 = tmp + 146;
187 5410 filter = ts_order2_coeffs + (t % 25) * 2;
188
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330010 for(i = 0; i < 60; i++){
189 324600 t = (ptr0[0] * filter[0] + ptr0[1] * filter[1] + 0x2000) >> 14;
190 324600 ptr0++;
191 324600 dec->newvec[i] = t;
192 324600 ptr1[i] = t;
193 }
194 }
195
196 5768 static void truespeech_place_pulses(TSContext *dec, int16_t *out, int quart)
197 {
198 int16_t tmp[7];
199 int i, j, t;
200 const int16_t *ptr1;
201 int16_t *ptr2;
202 int coef;
203
204 5768 memset(out, 0, 60 * sizeof(*out));
205
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46144 for(i = 0; i < 7; i++) {
206 40376 t = dec->pulseval[quart] & 3;
207 40376 dec->pulseval[quart] >>= 2;
208 40376 tmp[6 - i] = ts_pulse_scales[dec->pulseoff[quart] * 4 + t];
209 }
210
211 5768 coef = dec->pulsepos[quart] >> 15;
212 5768 ptr1 = ts_pulse_values + 30;
213 5768 ptr2 = tmp;
214
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136138 for(i = 0, j = 3; (i < 30) && (j > 0); i++){
215 130370 t = *ptr1++;
216
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130370 if(coef >= t)
217 113066 coef -= t;
218 else{
219 17304 out[i] = *ptr2++;
220 17304 ptr1 += 30;
221 17304 j--;
222 }
223 }
224 5768 coef = dec->pulsepos[quart] & 0x7FFF;
225 5768 ptr1 = ts_pulse_values;
226
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141397 for(i = 30, j = 4; (i < 60) && (j > 0); i++){
227 135629 t = *ptr1++;
228
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135629 if(coef >= t)
229 112557 coef -= t;
230 else{
231 23072 out[i] = *ptr2++;
232 23072 ptr1 += 30;
233 23072 j--;
234 }
235 }
236
237 5768 }
238
239 5768 static void truespeech_update_filters(TSContext *dec, int16_t *out, int quart)
240 {
241 int i;
242
243 5768 memmove(dec->filtbuf, &dec->filtbuf[60], 86 * sizeof(*dec->filtbuf));
244
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351848 for(i = 0; i < 60; i++){
245 346080 dec->filtbuf[i + 86] = out[i] + dec->newvec[i] - (dec->newvec[i] >> 3);
246 346080 out[i] += dec->newvec[i];
247 }
248 5768 }
249
250 5768 static void truespeech_synth(TSContext *dec, int16_t *out, int quart)
251 {
252 int i,k;
253 int t[8];
254 int16_t *ptr0, *ptr1;
255
256 5768 ptr0 = dec->tmp1;
257 5768 ptr1 = dec->filters + quart * 8;
258
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351848 for(i = 0; i < 60; i++){
259 346080 int sum = 0;
260
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3114720 for(k = 0; k < 8; k++)
261 2768640 sum += ptr0[k] * (unsigned)ptr1[k];
262 346080 sum = out[i] + ((int)(sum + 0x800U) >> 12);
263 346080 out[i] = av_clip(sum, -0x7FFE, 0x7FFE);
264
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2768640 for(k = 7; k > 0; k--)
265 2422560 ptr0[k] = ptr0[k - 1];
266 346080 ptr0[0] = out[i];
267 }
268
269
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51912 for(i = 0; i < 8; i++)
270 46144 t[i] = (ts_decay_35_64[i] * ptr1[i]) >> 15;
271
272 5768 ptr0 = dec->tmp2;
273
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351848 for(i = 0; i < 60; i++){
274 346080 int sum = 0;
275
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3114720 for(k = 0; k < 8; k++)
276 2768640 sum += ptr0[k] * t[k];
277
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2768640 for(k = 7; k > 0; k--)
278 2422560 ptr0[k] = ptr0[k - 1];
279 346080 ptr0[0] = out[i];
280 346080 out[i] += (- sum) >> 12;
281 }
282
283
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51912 for(i = 0; i < 8; i++)
284 46144 t[i] = (ts_decay_3_4[i] * ptr1[i]) >> 15;
285
286 5768 ptr0 = dec->tmp3;
287
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351848 for(i = 0; i < 60; i++){
288 346080 int sum = out[i] * (1 << 12);
289
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290 2768640 sum += ptr0[k] * t[k];
291
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2768640 for(k = 7; k > 0; k--)
292 2422560 ptr0[k] = ptr0[k - 1];
293 346080 ptr0[0] = av_clip((sum + 0x800) >> 12, -0x7FFE, 0x7FFE);
294
295 346080 sum = ((ptr0[1] * (dec->filtval - (dec->filtval >> 2))) >> 4) + sum;
296 346080 sum = sum - (sum >> 3);
297 346080 out[i] = av_clip((sum + 0x800) >> 12, -0x7FFE, 0x7FFE);
298 }
299 5768 }
300
301 1442 static void truespeech_save_prevvec(TSContext *c)
302 {
303 int i;
304
305
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12978 for(i = 0; i < 8; i++)
306 11536 c->prevfilt[i] = c->cvector[i];
307 1442 }
308
309 12 static int truespeech_decode_frame(AVCodecContext *avctx, AVFrame *frame,
310 int *got_frame_ptr, AVPacket *avpkt)
311 {
312 12 const uint8_t *buf = avpkt->data;
313 12 int buf_size = avpkt->size;
314 12 TSContext *c = avctx->priv_data;
315
316 int i, j;
317 int16_t *samples;
318 int iterations, ret;
319
320 12 iterations = buf_size / 32;
321
322
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12 if (!iterations) {
323 av_log(avctx, AV_LOG_ERROR,
324 "Too small input buffer (%d bytes), need at least 32 bytes\n", buf_size);
325 return -1;
326 }
327
328 /* get output buffer */
329 12 frame->nb_samples = iterations * 240;
330
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12 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
331 return ret;
332 12 samples = (int16_t *)frame->data[0];
333
334 12 memset(samples, 0, iterations * 240 * sizeof(*samples));
335
336
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1454 for(j = 0; j < iterations; j++) {
337 1442 truespeech_read_frame(c, buf);
338 1442 buf += 32;
339
340 1442 truespeech_correlate_filter(c);
341 1442 truespeech_filters_merge(c);
342
343
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7210 for(i = 0; i < 4; i++) {
344 5768 truespeech_apply_twopoint_filter(c, i);
345 5768 truespeech_place_pulses (c, samples, i);
346 5768 truespeech_update_filters(c, samples, i);
347 5768 truespeech_synth (c, samples, i);
348 5768 samples += 60;
349 }
350
351 1442 truespeech_save_prevvec(c);
352 }
353
354 12 *got_frame_ptr = 1;
355
356 12 return buf_size;
357 }
358
359 const FFCodec ff_truespeech_decoder = {
360 .p.name = "truespeech",
361 .p.long_name = NULL_IF_CONFIG_SMALL("DSP Group TrueSpeech"),
362 .p.type = AVMEDIA_TYPE_AUDIO,
363 .p.id = AV_CODEC_ID_TRUESPEECH,
364 .priv_data_size = sizeof(TSContext),
365 .init = truespeech_decode_init,
366 FF_CODEC_DECODE_CB(truespeech_decode_frame),
367 .p.capabilities = AV_CODEC_CAP_DR1,
368 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
369 };
370